Name: Jeff Chudakoff Partners: Alejandra Garcia Date: 2 December 2011 TA: Mengbin Chen Skill Building Exercise #2 Answer the forthcoming questions: 1. What does it average when a polymer is crosslinked? Crosslinked is one mode in which monomers add contemporaneously. In this course, detached polymer obligations are united via fetters among the specific polymer obligations. 2. We discussed how polymer adding and composition supply to its properties. How would you forecast the blindness, ductileity, and rectilinearity of a polymer that is branched to assimilate to one that is direct?
I would forecast the blindness of the direct polymer to be fur higher than the blindness of the branched polymer, which I would forecast to enjoy low blindness. The branched composition, though, would be over ductile than the direct composition. The direct polymer would be forecasted to enjoy over rectilinearity than the branched composition. 3. Consider the forthcoming polymer: a. Authenticate and delineate the chemical formula of the monomer from which this polymer is made of. Clearly expound the criteria you used to authenticate the monomer. State how multifarious carbons, oxygens, and hydrogens can be set in one monomer of this polymer. This is the monomer. C2H4O) In this monomer there are two carbons, four hydrogens, and one oxygen. I signed this as the monomer by looking for the repeating content of the polymer. b. This polymer is hydrophilic. Give a ostensible discuss for this proceeding. Your explication should be inveterate on the glaciscular composition of the polymer, the glaciscular composition of inspire, and the interactions among glaciscules of these two substances. You should use conditions such as polarity, polar fetter, arraign, interactions, charms, repulsions or hydrogen fetters. However, you should use singly those conditions that adduce to this top.
The polymer is surrounded by hydrogens via hydrogen fetters among the hydrogens and the carbons. This is a polar fetter, resulting in hydrogen life proportionately positively arraignd. Inspire glaciscules are also polar glaciscules. The oxygen has a proportionately indirect arraign and, thus, would interact delay the polymer. There would be charm among the oxygen of the inspire and the hydrogens of the polymer, characterizing a hydrophilic attribute of the polymer. 4. Nylons are determined delay two bulk. c. What do the 6 and 10 indicate in the designate of your operation?
The 6 and 10 indicate the sum of carbons in the two polymer obligations that are united to frame the nylon. The primary obligation [N(CH2)6N] has six carbons, while the relieve [C(CH2)8C] has ten carbons. d. Delineate the composition of nylon 5-12. 5. We did not number the percent surrender for our nylon structure owing we did not enjoy term to easily dry the operation, but it is an grave complexion of structure. Another inaptitude is that the polymer obligation tediousness can be changeable, so the glaciscular importance of the monomer is used. e. Assume you began delay correspondently 20. 00 mL of each reactant.
What is the limiting reagent? Show your operation. 20. 00mL ? 1L1000mL ? 0. 5mol1L=0. 01mol Hexamethylenediamine 20. 00mL ? 1L1000mL ? 0. 2mol1L=0. 004mol Sebacic Acid Since the glacis relative is 1:1, the one delay hither is the limiting reactant. Therefore, Sebacic Acid is the limiting reactant. f. What is the presumptive surrender in grams of Nylon 6-10? The glacis relative is 1:1; so, we would forecast to get the selfselfsame sum of glaciss as the limiting reactant (0. 004mol) of Nylon 6-10. 0. 004mol Sebacoyl chloride ? 1 mol 6-10 nylon monomer1 mol Sebacoyl chloride? 282. 42g1mol 6-10 nylon monomer=1. 13 grams 6-10 nylon